What’s Vulnerable › Vulnerabilities

CVE-2026-18428: SQL Query Validation Bypass in OpenSearch Direct Query

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-08-14
• Weakness: CWE-693

Description

A SQL query validation bypass in the Flint extension query handler in the OpenSearch SQL plugin allows a remote authenticated actor with async query access to execute arbitrary code on Apache Spark workers by sending a crafted SQL query to the direct query endpoint.

Affected products

• AWS Opensearch: from 2.13 through 3.5
• Github Opensearch: from 2.13 through 3.6

References

• https://aws.amazon.com/security/security-bulletins/2026-081-aws/
• https://docs.aws.amazon.com/opensearch-service/latest/developerguide/service-software.html
• https://github.com/opensearch-project/sql/security/advisories/GHSA-g4jr-343c-fvjm
• https://opensearch.org/artifacts/by-version/?_gl=1*d14pqp*_up*MQ..*_ga*Nzc5NTAxNzM2LjE3ODM1NTA2NDA.*_ga_BQV14XK08F*czE3ODM1NTA2NDAkbzEkZzEkdDE3ODM1NTA3MTQkajU2JGwwJGg3NTc4ODY0OTM.#release-2-19-6
• https://opensearch.org/artifacts/by-version/?_gl=1*d14pqp*_up*MQ..*_ga*Nzc5NTAxNzM2LjE3ODM1NTA2NDA.*_ga_BQV14XK08F*czE3ODM1NTA2NDAkbzEkZzEkdDE3ODM1NTA3MTQkajU2JGwwJGg3NTc4ODY0OTM.#release-3-7-0

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